The 2008 Tercera División play-offs to Segunda División B from Tercera División (Promotion play-offs) were the final playoffs for the promotion from 2007–08 Tercera División to 2008–09 Segunda División B. In some groups four teams took part in the play-off while other groups have only three.
The teams highlighted in yellow played the Play-Offs to Segunda División B. The teams highlighted in red were relegated to Divisiones Regionales. All groups as 38 of 38 rounds.
Eliminatories
The regular season finished the 18 May 2008. The play-offs began the 24 and 25 of May.
Group 1
1st Eliminatory:
2nd Eliminatory:
Promoted to Segunda División B:Sangonera Atlético
Group 2
1st Eliminatory:
2nd Eliminatory:
Promoted to Segunda División B:FC Barcelona B
Group 3
1st Eliminatory:
2nd Eliminatory:
Promoted to Segunda División B:Ciudad Santiago
Group 4
1st Eliminatory:
2nd Eliminatory:
Promoted to Segunda División B:CD San Fernando
Group 5
1st Eliminatory:
2nd Eliminatory:
Promoted to Segunda División B:Racing Santander B
Group 6
1st Eliminatory:
2nd Eliminatory:
Promoted to Segunda División B:UD Alzira
Group 7
1st Eliminatory:
2nd Eliminatory:
Promoted to Segunda División B:Las Palmas B
Group 8
1st Eliminatory:
2nd Eliminatory:
Promoted to Segunda División B:CD Roquetas
Group 9
1st Eliminatory:
2nd Eliminatory:
Promoted to Segunda División B:Antequera CF
Group 10
1st Eliminatory:
2nd Eliminatory:
Promoted to Segunda División B:Real Murcia B
Group 11
1st Eliminatory:
2nd Eliminatory:
Promoted to Segunda División B:UE Sant Andreu
Group 12
1st Eliminatory:
2nd Eliminatory:
Promoted to Segunda División B:Valencia Mestalla
Group 13
1st Eliminatory:
2nd Eliminatory:
Promoted to Segunda División B:Atlético Baleares
Group 14
1st Eliminatory:
2nd Eliminatory:
Promoted to Segunda División B:Ciudad Lorquí
Group 15
1st Eliminatory:
2nd Eliminatory:
Promoted to Segunda División B:CDA Navalcarnero
Group 16
1st Eliminatory:
2nd Eliminatory:
Promoted to Segunda División B:Balompédica Linense
Group 17
1st Eliminatory:
2nd Eliminatory:
Promoted to Segunda División B:Santa Eulàlia
Group 18
1st Eliminatory:
2nd Eliminatory: